JPH01117920A - Intake device of v-shaped engine - Google Patents

Abstract

PURPOSE:To make the constitution of an entire engine body compact body by placing a mechanical supercharger above an intake manifold put in the middle space of one V-shaped bank, mounting an intercooler above the other bank and connecting the upper stream end of the intake manifold to the outlet of the intercooler. CONSTITUTION:Primary and secondary cylinder groups consisting of cylinders wherein intake actions are not executed successively are respectively connected to a pair of banks 1L and 1R of a V-shaped six-cylinder engine, and independent intake pieces 7a to 7f connect, respectively, intake ports 3a to 3f of the cylinders 2a to 2f to left and right intake manifolds 5L and 5R separated by a partition wall 6. An engine-driven mechanical supercharger 9 is placed above the intake manifolds 5L and 5R an air cooling intercooler 15 is above the left and right banks 1L. A capacity part 25 is placed at the exit portion of the intercooler 15, each of the intake manifold 5a and 5b of the cylinder groups is connected to the exit portion and the entry portion of the intercooler is connected to the exit portion 10b of the supercharger 9 by an intake pipe 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intake system for a V-type engine that includes a mechanical supercharger and an intercooler in its intake system.

(Prior art) In a V-type engine, which has a pair of bank parts each having a plurality of cylinders and forming a V-shape with each other, the space next to the engine is usually narrow, so it is difficult to find a mechanical supercharger ( The issue is whether to install a supercharger.

For example, in the V-type engine described in Japanese Utility Model Publication No. 61-1624, a mechanical supercharger is installed in the center of the bank. In order to increase the output, it is necessary to provide an intercooler, which complicates the piping of the intake pipe, leading to problems such as a decrease in output due to an increase in intake resistance and worsening of fuel efficiency.

On the other hand, when attempting to increase the engine's output in the low rotational speed range by inertial supercharging, the surge tank that makes up the pressure inversion section occupies a large volume, which poses a major constraint in reducing the height of the engine.

(Purpose of the Invention) Therefore, the present invention aims to make a ■type engine equipped with a supercharger and an intercooler in the intake system compact, simplify the intake piping, and obtain an inertial supercharging effect without providing a surge tank. The purpose of the present invention is to provide an intake system for a V-type engine that can perform the following steps.

(Structure of the Invention) The present invention provides: (1) In a V-type engine equipped with intake manifolds of both left and right banks in the center space of the banks, a supercharger is arranged above the intake manifolds, and an intercooler is arranged above one bank. At the same time,
The intercooler is characterized in that a volume portion is provided at the outlet portion of the intercooler, and the upstream ends of the intake manifold pipes of the cylinder groups of each bank are connected to this outlet portion.

(Effects of the Invention) In the present invention, since the intake manifold, supercharger, and intercooler are all arranged above the engine body, the entire engine can be made more compact, including the arrangement of the intake pipe. Furthermore, the simplification of the intake piping reduces intake resistance and also reduces the rise in intake temperature, which improves supercharging efficiency, increases output, and reduces fuel consumption.

Furthermore, in the present invention, a volume part is provided at the outlet part of the intercooler, and the upstream end of the intake manifold pipe of the cylinder group of each bank is connected to this outlet part, so that the volume part functions as a surge tank. This makes it possible to obtain an inertial supercharging effect. Therefore, it is possible to increase the output of the engine in the low rotation range.

(Example) Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

Although a V-type engine has the advantage that its length in the crankshaft direction is shorter than an in-line engine, it is important to suppress its height in order to make the engine more compact. Therefore, in this example, we took full advantage of the advantages of resonant supercharging with a compact intake system, suppressed the height of the engine, and improved the output torque in the high rotation range. By providing this, the output torque in the low rotation range is improved due to the inertial supercharging effect.

Figure 1 is shown in order to facilitate understanding of this embodiment.
FIG. 2 is a schematic plan view schematically showing the entire structure. In addition, FIG. 2 is a front view of this embodiment, FIG. 3 is a plan view, and FIGS. 4 and 5 are the rV-rV line and
- It is a sectional view along the V line.

In FIGS. 1 to 3, the V-type engine main body E has a left bank IL and a right bank IR that are arranged to form a V-shape with each other. The left bank IL is No. 1, No. 3,
It has three cylinders 2a, 2c, and 2e numbered 5, and the right bank IR has three cylinders 2b, 2d, and 2f numbered 2, 4, and 6.
It has six cylinders in total. The firing order of each cylinder is, for example, 1-6 → 3 → 4 → 5 → 2, i.e. 2a →
2f → 2c → zd-2e → 2b, left bank I
The cylinders 2a, 2c, and 2e in L constitute a first cylinder group in which the ignition order is not adjacent to each other, and the cylinders 2b, 2d, and 2f in the right bank IR constitute a second cylinder group in which the ignition order is not adjacent to each other. . The intake boats 3a to 3f in each of the cylinders 2a to 2r open toward the central space of the V bank, respectively. On the other hand, the exhaust ports 4a to 4f each open on the side opposite to this central space, and are of a so-called cross-flow type.

Each cylinder 2a, 2C12e in left bank LL,
and each cylinder 2b, 2d, 2f in the right bank IR
These are arranged in series parallel to the crankshaft (not shown). Also, both banks ILS IR are offset in the crankshaft direction, so that the left bank ILO
The right bank IR is located forward of the right bank IR (lower in FIGS. 1 and 3).

In the central spaces of both the left and right banks IL and IR, there are downstream intake manifold pipes 5L and 5R extending from the front side of the crankshaft into the V bank central space parallel to the crankshaft, as is clear from FIG. 6 and are arranged in an integrated manner. The left downstream intake manifold pipe 5L is connected to the intake bows 3a, 3c, and 3e in the left bank IL via three short independent intake pipes 7a, 7c, and 7e, respectively.

A mechanical supercharger (supercharger) 9 driven from the crankshaft via a belt is connected to a cylindrical rod housing IO
In Fig. 1, it is shown on the right side of the engine body E and downstream intake manifold pipes 5L and 5R so as not to overlap, but in reality, it is clear from Figs. As such, it is arranged above the downstream intake manifold pipes 5L and 5R so that its axis is parallel to the crankshaft. 9a is a pulley on which the drive belt is suspended, and 9b is a clutch. Then, on the outer periphery of clutch 9b, left and right bank IL
, an idler 23 of a timing belt 8 for driving cams of the IR is rotatably provided. 24 is a helmet cover.

A throttle body 12 including a throttle valve 11 is arranged above the right bank IR.

The downstream end of an intake pipe 13 extending perpendicularly to the crankshaft from the throttle body 12 is connected to an inlet portion 10a provided on the rear end surface of the supercharger housing 10. The outlet portion 10b of the supercharger 9 is connected to the supercharger housing 10
is provided above the front end of the

On the other hand, the air-cooled intercooler I5 having a flat housing 14 is drawn on the left side of the engine main body E so as not to overlap with it in Fig. 112, but in reality it is shown in Fig.
As is clear from FIG. 3, the left bank IL is integrated with the cylinder head cover 3OL of the left bank IL.
It is located above the . and supercharger housing 10
A short intake pipe 16 whose upstream end is connected to an outlet portion 10b of the intercooler housing 14 is connected to an inlet portion 14a provided at the front end of the right side of the intercooler housing 14. The configuration of this air-cooled ink cooler 15 is well known per se, so a detailed explanation will be omitted. Traveling air taken in while the vehicle is running is blown onto the upper surface of the ink cooler 15 from the provided scoop, thereby cooling the intake air.

The outlet portion 14b of the intercooler 15 is provided at the rear left corner of the intercooler housing 14, and forms a volume portion 25 inside.Two upstream intake manifold pipes 17L are connected to the outlet portion 14b.

17R is led out toward the center of the V bank.

These upstream intake manifold pipes 17L and 17R are respectively curved downward, and their downstream ends are the downstream end of the downstream intake manifold pipes 5L and 5.
They are respectively connected to the upper surface of the rear end of R. The upstream intake manifold pipes 17L and 17R are formed to have approximately the same length.

On the other hand, as is clear from FIG. 1, the downstream intake manifold pipes 5L, 5R have extension parts 18L, 18R on the opposite side from the end to which the upstream intake manifold pipes 17L, 17R are connected.
These extensions 18L.

18R is provided. This communication section 19 becomes a pressure reversal section when performing resonance supercharging. Opening/closing valves 20L, 20R are provided in the extensions 18L, 18H. Although the extensions 18L and 18R are depicted as extending linearly toward the rear of the engine body E in FIG. 1, in reality these extensions 18L and 18R and the communication section 19 are 4rgJ, as is clear from FIG. 5, the downstream side intake manifold pipes 5L, 5R are configured to be folded downward and rearward from their front ends, and are in contact with the lower surfaces of the downstream side intake manifold pipes 5L, 5R. It is formed integrally with the downstream intake manifold pipes 5L and 5R.

The re-extension parts 18L and 18R are partitioned by a partition wall 21 extending parallel to the crankshaft, and the front ends thereof are connected to communication holes 22L and 221? downstream side intake manifold pipes 5L, 5R via
are in communication with each other. These downstream intake manifold pipes 17
L, 17R1 upstream intake.

The collecting pipe SL, the 5R1 extensions 18L, 18R, and the independent intake pipes 7a to 7f are integrally molded by casting to form an intake manifold 32, and this intake manifold 32 is designed to join the lower ends of the independent intake pipes 7a to 7f together. It is fixed to the engine body E by tightening the flanges 33L and 33R formed in the banks IL and IR with bolts, respectively.

On-off valve 20L provided in the extension parts 18L and 18H,
The 2OR is controlled to open in the high-speed rotation region of the engine, and as a result, the downstream side intake manifold pipes 5L and 5R are communicated with each other through the communication part 19, and resonance supercharging is performed, so that the engine It is designed to improve torque in the high-speed rotation range.

When performing such resonance supercharging, the volume of the intake passage is small, so the amplitude of the pressure oscillation can be made sufficiently large to obtain a large resonance supercharging effect, and the height of the intake manifold can be significantly increased. This is particularly effective when the mechanical supercharger 9 is disposed above the central space of the V bank as in the present invention. A volume part 25 is provided inside the outlet part 14b of the ink cooler 15, and the upstream ends of the upstream intake manifold pipes 17L and 17R are connected to the volume part 25.
5, it is possible to obtain an inertial supercharging effect of the intake air using the volume portion 25 as a pressure inversion portion, thereby making it possible to improve the torque in the low speed rotation range of the engine.

Further, a pipe 27 forming a relief passage 26 is connected between the upstream side of the intake pipe 13 and a volume part 25 formed at the outlet part 14b of the intercooler housing 14. Relief valve 2 that opens and closes
8 is provided.

When the boost pressure exceeds a predetermined value, the relief valve 28
is activated to lower the boost pressure.

On the other hand, in order to provide fuel to each cylinder 2a-2f, a fuel injection valve 29 is attached to the downstream end of each independent intake pipe 73-7f, respectively. In Fig. 3, this fuel injection valve 2
The mounting hole for the fuel injection valve 29 is indicated by the reference numeral 35 in FIG. 4, although the reference numeral 9 is omitted. The fuel injection valve 29 is configured as an injection deflection type, as is clear from the injection direction indicated by the arrow in FIG. This contributes to ease of installation when the supercharger 9 is placed in the center section of the V bank.

The above is the configuration of the embodiment of the present invention. According to this embodiment, the intake system is a so-called "compact intake system" configured to perform resonance supercharging, and furthermore, the supercharging 119 and Since all the intercoolers 15 are assembled above the engine body E, the entire engine can be made more compact, including the arrangement of the intake pipes 13, 16, etc.

Furthermore, since the length of the intake pipe on the downstream side of supercharging 419 can be shortened, intake resistance is reduced and temperature rise due to supercharging is also small. Therefore, the efficiency of the supercharger 9 is improved, and both output and fuel efficiency are improved.

Furthermore, upstream intake manifold pipes 17L, 1
Since the upstream end of 7R is connected, the pressure reversal effect of this volume portion 25 allows effective use of the inertial supercharging effect of intake air in the low rotation range.

Also, the relief passage 26 is connected to the ink cooler housing 14.
Since the intake air is led to the volume part z5 formed at the outlet part 14b of the valve, when the relief valve 28 is in the open state, the intake air can be distributed well to the left and right banks, and the relief valve 28 also suppresses pressure fluctuations in the intake air. It also has the advantage of being difficult to pick up.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view developed and schematically shown for explaining the configuration of an embodiment of the present invention, FIG. 2111 is a front view with a part of the embodiment of the present invention in cross section, and FIG. Its plan,
4 is a sectional view taken along line IV--IV in FIG. 2, and FIG. 5 is a sectional view taken along line V-V in FIG. 2. IL, IR-Bank 2a to 2f-
Cylinders 3a to 3f--Intake boats 5L, 5R--Downstream intake manifold pipes 7a-7r--Independent intake pipes 9-Mechanical supercharger I5
・-Ink cooler 17L, 17R-Upstream intake manifold pipe

Claims (1)

[Claims] In a V-type engine equipped with intake manifolds of both left and right banks in the central space of the V-bank, a mechanical supercharger is disposed above the intake manifold,
and an intercooler is disposed above one bank, and a volume portion is provided at an outlet portion of the intercooler,
An intake system for a V-type engine, characterized in that the upstream ends of intake manifolds of cylinder groups in each bank are connected to this outlet portion.